More than likely it was a Kernel Panic. See if any Kernel Panics logs exist in "/Library/Logs/DiagnosticReports". Most Kernel Panic logs will have file names with "kernel" and/or "panic" in the name. If none are in this folder, then check the "Retired" subfolder. Post several of the Kernel Panic logs here just as you did for the other System Log file.
FYI, except for the Kernel Panic logs, most of the other macOS system logs are worthless for troubleshooting these days. Plus the only way to actually get those other logs is with the command line...again they are mostly worthless for troubleshooting.
You can also run the third party app EtreCheck and post the complete report here so we can examine it for possible clues especially if third party software may be at fault. This report also includes summaries of the system logs as well.